mm: add speculative page fault vmstats
Add speculative_pgfault vmstat counter to count successful speculative page
fault handling.
Also fixing a minor typo in include/linux/vm_event_item.h.
Change-Id: I0d3f3dc5195e1156d4b8edf83aff9d8d85904e8e
Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Patch-mainline: linux-mm @ Tue, 17 Apr 2018 16:33:29
[vinmenon@codeaurora.org: 4.9 porting conflicts]
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
diff --git a/mm/memory.c b/mm/memory.c
index 1580c29..da4153f 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4008,6 +4008,7 @@
* If there is no need to retry, don't return the vma to the caller.
*/
if (ret != VM_FAULT_RETRY) {
+ count_vm_event(SPECULATIVE_PGFAULT);
put_vma(fe.vma);
*vma = NULL;
}